Before any of the issues above, the very first questions you should be asking yourself are:
1) What are this VCs credentials beyond bringing in money? Past performance is not an indicator of future performance, but past behavior is.
2) What other commits does this VC have? Other board positions, existing VC obligations, even significant equity stakes in other companies? Or, Deity forfend, in competitors?
3) How much equity are you giving up? 30% or more for say, $500K or less means you're pretty much stuck with this person forever. You'll have a hard time getting anyone else to buy in unless you really blow up.